Just some thoughts:
We have a 2008 Acura MDX (our 3rd MDX), that has been one of the best cars I have ever owned - it is my wife's car- it is very safe and convenient. The 1st couple years the avg. mpg was about 16.5. It now has 65,000 miles and the avg. mpg is up to 17.5 mpg for the last year.
Every winter we make lots of ski trips - the MDX was getting too small for this so we started taking my pickup beginning with the 06 Megacab (sold) and then the 08 Duramax (sold). BTW, both the 5.9 Cummins and the Duramax were deleted and chipped. On these trips my fuel economy was never better than 15 or so with either truck and the MDX got about 16. The mountain driving in the winter never yields the best fuel economy.
However, I have put on about 1,500 miles on the Scorpion on ski trips and my average mpg has been about 18.5!! What is odd, is this has been my avg. fuel economy overall too! Irregardless, this is very very good fuel economy, in my opinion, and in my experience. And, I might add the vehicle has been nothing but an absolute dream to drive. Going up and down Colorado passes has been a cinch, and a pleasure to drive. The comfort offerd to passengers, the safety, the utility, the power, the quiet cab - I could go on and on and on. . . I really cannot think of a single thing the truck could have done better on these trips.
I am about as happy (so far) with the Scorpion as I have been with any vehicle I have ever bought, and I have had some other vehicles that have been very nice:
BTW, A 1970 Buick GS 455, a 1999 Lexus LS 400 and a 2002 BMW M5 (my alltime favorite) have been some of my other favorites.
Another reason, the Scorpion works for me (and other business owners) - I can take 100% of the cost of the Scorpion as an IRS Section 179 deduction, in the 1st year! So, even though the MSRP was nearly $63k, the net cost for me, is $38,182, after deductions from MSRP and after tax savings. Let's say I had bought the gas version of this truck, the net cost to me (for the vehicle, after tax deduction) would have been $32,400, or about $5,782 less. I drive about 26,000 miles per year, so over three years I will buy 4,333 gallons of diesel (assuming 18 MPG - my current avg.). If I had bought the Super Duty gasser let's assume I could average 15.5 MPG, so I would burn 5,032 gallons.
Diesel cost over three years at $4.00 per gallon = 4,333 X $4.00 = $17,332
Gas cost over three years at $3.35 per gallon = 5,032 X $3.35 = $16,857
But, this is deductible in my business so the net cost of fuel, after tax deduction is about
Diesel - $12,480
Gas - $12,137
So, the cost of fuel is $343 more, for the diesel, over three years. But, the cost of the vehicle was $5,782 more to begin with. However, when I trade it in, the diesel should be worth this difference in trade. If I compare the NADA bluebook value of two used three year old Super Duties, the difference in private party value is about $6,000. So, I think the net cost of the diesel over and above the gas, after tax savings, is really pretty marginal. I am assuming that other maintenance costs for the diesel compared to the gas is about the same - this is probably not quite right, but I don't think my assumption is gigantically off.
THe net net for me - I get to drive a much more enjoyable Scorpion diesel for an insignificant (net) amount more than a Super Duty gasser!